Automatic gas cut-off



- 1,617,156 R. R. HARDWAY AUTOMATIC GAS CUT-OFF Feb. 8, 1927.

Filed Se t. 20. 1925 2 SheetsShee t 1 Feb. s, 1927.

R. R. HARDWAY AUTOMATIC GAS CUT-OFF Filed Spt. 20. 192; 2 Sheets-Sheet 2 May;

Patented Feb. 8,1927.

AUTOMATIC GAS CUT-OFF.

Application filed September 20, 1923. krial-No. 663,856.

l/Vhen the outlet of a gas service is open and the gas issuing therefrom is consumed, there is no danger of the room or other place in which said' outlet is located becoming filled with gas and causing asphyxiation or explosion. However, should the supply 'ofgas be temporarily I suspended from any cause, the flame is extinguished and when the supply is reestablished, the gasescaping at the open outlet is not consumed and fills the room or other place in which the outlet is located, thereby becoming a source or danger and liable to cause asphyxiation or explosion and fire.

The present invention provides means whereby the gas outlet is automatically closed when the supply of gas is temporarily suspended, so that when the supply is reestablished the gas cannot escape because of the closed outlet. v 7

Other objects and advantages will be apparent and suggest themselves as the nature of the invention is understood. v V l/Vhile the drawings illustrate an embodiment of the invention it is to be understood that in adapting the same to meet different conditions and requirements, various changes in the form, proportion and minor details of construction may be resorted to without departing from the nature of the invention.

Referring to the accompanying drawlngs torming a part M the application:

Figure 1 1s a side view showing the invention applied,

Figure 2 is a top plan view, .Figure 3 is a vertical longitudinal section on the line 3-3 of Figure 2,

Figure 4 is a horizontal section on the line 44 of Figure ,8,

Figure 5 is a fragmentary view of the detent mechanism, and

Figure 6 is a sectional detail on the line 6-6 of Figure 3.

Corresponding and like parts are referred to in the JEollowing description and desig-.

nated in the several views of the drawings by like reference characters.

The numeral 1 designates the casing of a globe valve of ordinary construction and 2 is the valve for controlling the flow through the casing. The stem 3 of the valve is threaded in the casing in the usual way and its outer end is provided with a hand'wheel 4 or analogous part for opening and closing the valve as required. A washer 5 is fitted seated to preclude any escape of gas. coil spring 6 coacts with the valvestem 3 upon the inner end of the valve stem and i insures a tight joint when the, valve is unto normally hold-the valve- 2 seated. The inner endofthe spring 6 is attached to the valve stem and its outer end is attached to a housing 7 which is of cup-shape.-. A toothedlwheel 8 is fast to the valve stem 3 so as to turn therewith and a detent 9 coacts therewith to normally hold the valve in open position. The detent 9 is pivoted intermediate its ends to the housing 7 and its active end cooperates with the teeth of the element 8.

A. pressure regulator is provided to automatically trip. the detent 9 in the event of the pressure of gas being temporarily suspended, thereby releasing the valve which is automatically closed by means of the spring 6 The pressure regulator comprises a sec tional casing 10 and a diaphragm 11 clamped'between the sections of the casing. I .The lower portion of the casing is in com- -munication with the service pipe 12 and under normal conditions the pressure of gas acts upon the diaphragm 11 to admit of the automatically close by the action of the spring 6. A. slotted stem 12 operates throughthe upper section of the casing 10 and is connected to the diaphragm 11 and is provided at itsupper end with a weight 13.

The outer end of the detent 9 passes throughthe slot 14 of the stem 12 and under normal conditions, the stem 12 is held elevated andthe detent 9-is free to engage the teeth of derstood that the valve must be positively operatedwhen it is required to again open the outlet. The upper section of the casing is provided with a'recess 10 in its inner side to receive the upper nut of a pair of nuts 12 applied to the stem 12 for securing the diaphragm thereto. This arrangement admits of the diaphragm lying close against the inner side of the upper section of the casing 10 when at the limit of its upward movement thereby preventing injury thereto. A stuffing box 10 maintains a close joint between the stem 12 and the casing 10.;

rigid elongated detentextending across the I top of and pivoted to the upper edge of the housing adapted at one end to engage said toothed Wheel and hold the valve stem against rotation, and means controlled by gas passing through the valve directly engaging said detent at the other end to release the detent from engagement with the toothed wheel. I

In testimony whereof I affix my signature.

ROY n. HARDWAY. 

